Drill.



No. 627,847. 7 Patented lune 27, I899. L. DURKEE.

DRILL.

(Applicaltion filed Oct 25, 1898.) (No Model.)

2 sheets-Sheet I. R ill-IF; I?

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I .51. WITNESSES ATTORNEYS.

Fatentedlune 27, I899. I

L.. DURKEE.

D R IL L (Application filed Out. 25, 1898.)

Shoet 2.

2 Sheefs (No Model.)

Alllll l1 WITNESSES ENTOB A 0a rs.

UNITED STATES PATENT OFFICE.

LAFAYETTE DURKEE, OF DENVER, COLORADO.

' ADRILL.

SPECIFICATION forming part of Letters Patent No. 627,847, dated June 27,1899.

A Application filed October 25, 1898. Serial lie. 694,548. (No model.) I

To all whont it may concern:

-Be it known'that I, LAFAYETTE DURKEE, of Denver, in the county ofArapahoe and State of Colorado, have invented a new and Improved Drill,of which the following is a full, clear, and exact description.

My invention relates to an improvement in drills of the kind sometimescalled jump drills or that class in which the reciprocating drivingmember has a spring connection with the drill-holder.

My invention consists of certain; novel means of connecting the drivingmechanism with the drill, so that the reciprocation of the drill in onedirection is made more rapid than in the other direction, and also in acompensating spring by which the weight of the drill holder is carried.

My invention further consists in the novel features hereinafterdescribed and claimed. Reference is to be had to the accompanyingdrawings, forming a part of this specification,

in which similar characters of reference indicate corresponding parts inall the views.

Figurel is alongitudinal section of my device. Fig. 2 is a top plan viewof the same. Fig. 3 is a sectional elevation of the same on the line 3 3in Fig. 1; and Figs. 4, 5, 6, and 7 are sectional side elevationsshowing the different positions ofthe vibrating parts.

Within any suitable frame A is mounted the drill-holder B, whichconsists of a rod mounted so that it may reciprocate within the frame,and the holder is provided with any suitable means by which the drillmay be securedthereto. Surrounding this drillholder are twospirally-coiled springs E and E, which at their opposite or outer endsbear against collars e and c, secured to the drillholder B. The collarse and c may be made adjustable upon the drill-holder, so as to vary thetension of the springs.

Between the adjacent or inner ends of the springs E or E and surroundingthe drillholder B is a block F, provided with two oppositely-extendingpins f, by which it is engaged and reciprocated, as hereinafter morefully described. Upon a shaft D, which lies ter of convenience indesign, and it might as well be a straight lever. Each end of the leverD is provided with a slot, the slot cl embracing the pins f upon theblock F and the slot d in the opposite end of the lever embracing acrank-pin g, which is carried upon a shaft G, suitably mounted in theframe; The end of the lever D which engages the block F is formed as ayoke, having an arm upon each side of the block F, as clearly shown inFig. 3.

The crank-shaft G has a fly-wheel H secured to one or both ends thereofand is rotated by means of a pinion I, which is secured 'to the shaftand forms one member of a train of gears, which are mounted in the frameand consist of the gears J and L and the pinions K and I. The gear L ismounted upon ashaft L,whic11'is provided with cranks M, by which it maybe turned by hand, or is otherwise connected with anysuitable motor. Themotor, if its revolution is sufficiently rapid, may be directlyconnected with the shaft D., thus doing away with the speed-multiplyingtrain of gears. The train of gears is journaled in a frame A, which ismounted to slide upon the frame A by means of the dovetail connectionshown at a in Fig. or in any other equivalent manner, so that it may bemoved toward and from the pivot of the lever D. By this means the strokeof the lever D and of the drill is varied as may seem best suited to thework being done. The adjustment is secured by a threaded bolt A which isheld in the rear end of the frame-A and screws into a lug A? upon thesliding frame A, the bolt being provided with a hand-wheel or otherconvenient rotating means upon its outer end.

-A third spirally-coiled spring E is placed about the drill-holder B andbears at one end against a collar c and at its other end is adapted toengage the portion of the frame through which the drill-holder slides.The object of this latter spring is to act as a buffer to ease theextreme rearward throw of the drill-holder. The weight of the drill andthe drill-rod is compensated for by a spring 0, which is secured at oneend to the vibrating lever D and at its other end to any suitablesupport upon the frame A. This spring 0, when in the position shown infull lines in the drawings, serves to support the weight of the 4 drilland drill-holder, so that the springs E and- E are employed only toovercome the inertia of the parts. The spring 0 may be freed from thelever D when the drill is operating horizontally, or if the drill isWorking upward instead of downward the spring may be detached from thelever at the point shown in the drawings and attached, as shown bydotted lines, when its action will be in an opposite direction. Thisreversibility of attachment of the spring 0 makes it possible tocompensate for the weight of the reciprocating parts when the drill isused in any position. This spring 0 is adjustable and is to compensatefor extra weight of steel as the drill is lengthened.

By reason of the crank-pin directly engaging the slot 61 in the leverthe vibration of the lever is more rapid in one direction than in theother, as the crank-pin is near the pivot of the lever. This results inmaking the working length of the lever shorter during the downwardstroke than during the return stroke, and in consequence makes thedown-' ward or striking stroke a more rapid one than the return stroke.This causes a more effective application of the power and more rapiddrilling than where both strokes are at the same speed.

The device as a whole is supported upon any of the usualdrill-supporting devices and is fed toward and from the work in theusual way. These features, forming no part of my invention, are notherein shown and described.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. A drill, comprising a drill-holder mounted toreciprocate, a pivoted lever connected with the drill-holder, arevolving shaft having a crank-pin connected with said lever to vibrateit, means for rotating the shaft, and a spring connecting the pivotedlever with a fixed support, whereby the weight of the drillholder may becompensated for, as the drill operates.

2. A drill, comprising a drill-holder mounted to reciprocate, a pivotedlever connected with the drill-holder, a revolving shaft having acrank-pin connected with said lever to vibrate it, means for rotatingthe shaft, and a spring having one end connected with a fixed support,and its other end adapted to be attached to the pivoted lever on eitherside of its pivot, whereby the weight of the drillholder may becompensated for as the drill Works either up or down.

3. A drill, comprising a drill-holder mounted to reciprocate andprovided with pins, a pivoted lever having a slot in each end, the lowerend of the lever being bifurcated to extend on each side of the holderand into the slot of which extend the pins of the drillholder, arevolving shaft, a crank-pin carried by the said shaft entering the slotin the upper end of the lever, and means for rotating said shaft,substantially as described.

4. A drill, comprising a drill-holder mounted to reciprocate, a pivotedlever having a slot in each end, a spring connecting the upper end ofthe lever with the frame of the drillholder, a crank-shaft, a crank-pincarried by said shaft and entering the upper slot in the lever, andmeans for rotating said shaft.

5. A drill, comprising a drill-holder mounted to reciprocate, a pivotedlever having a slot in each end, a crank-shaft, a crank-pin carried bysaid shaft and entering the upper slot in the lever, means for rotatingsaid shaft, a block connected with the other end of the lever andsurrounding the drill-holder, and a spring surrounding the drill-holderon each side of the block and connected at opposite ends with the blockand holder.

6. A drill, comprising a drill-holder mounted to reciprocate, a pivotedlever having a slot in each end and connected at the upper end with theframe of the drill-holder, a crankshaft, having movable journalsshiftable toward and from the pivot of the lever,a crankpin' carried bysaid shaft and entering the upper slot in the lever, means for rotatingsaid shaft, and a spring connecting the pivoted lever with a fixedsupport, whereby the weight of the drill-holder may be compensated foras the drill operates. I

7. A drill, comprising a drill-holder mount ed to reciprocate, a pivotedlever connected with the drill-holder to reciprocate it, a revolvingshaft having a crank-pin connected with said lever to vibrate it, meansfor varying the point of connection with the lever to vary the stroke,means for rotating the shaft,

and a spring connected with a vibrating member and a fixed support,whereby the weight of the drill-holder may be compensated for, as thedrill operates.

8. A drill, comprisingaframe, adrill-holder mounted to reciprocatewithin the frame, a

pivoted and spring-pressed lever mounted in the frame and having a slotin one end and connected at the other end with the drillholder, a slidemounted on the frame to move toward and from the pivot of said lever, arevolving shaft journaled in said slide, a crankpin carried by saidshaft and entering the slot in the lever, and means for rotating saidshaft, substantially as described.

9. A drill, comprising a frame, a drill-holder mounted to reciprocate inthe frame, a pivoted lever mounted in the frame and having a slot in oneend, the other end of the lever being connected with the drill-holder, aslide mounted on the frame and adjustable toward and from the pivot ofthe said lever, a revolving shaft journaled in the slide and providedwith a crank-pin Working in the slot of the lever, anda gearing foroperating said shaft, said gearing being also mounted in the slide,substantially as described.

10. A drill, comprising a frame, a reciproeating drill-holder mounted inthe frame and the upper end of the lever, and driving mecli providedwith pins, a pivoted and spring-ae- 'anism also mounted in the slide,substan i6 tuated bell-crank lever mounted in the frame tially asdescribed.

and having its ends slotted, the lower end be T w ing forked, a slidemounted on the frame and LAFAX ET DURKEE adjustable toward and from thepivot of the Witnesses:

lever, a shaft mounted in the slide and pro- AUGUSTUS TIT-US,

vided with a crank-pin working in the slot at CAMPBELL D. THUS;

